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    <title>Document</title>
    <script>
        //数组长度 数组名.length
        var arr=['关羽','张飞','马超','赵云','黄忠','刘备','姜维'];
        for(i=0;i<7;i++){
            console.log(arr[i]);
        }
        console.log(arr.length);
        for(i=0;i<arr.length;i++){
            console.log(arr[i]);
        }
        //1.数组长度是元素个数  不能跟索引号混淆
        
    </script>
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